CN110660506A - Fireproof cable - Google Patents

Abstract

The invention discloses a fireproof cable, which belongs to the technical field of cables. It includes at least four main electric cable cores and one ground cable core, each of the main electric cable cores and one ground cable core is wrapped with a wrapping layer, and the wrapping layer is extruded outside. It is covered with an insulating inner sheath layer, the outer insulating inner sheath layer is filled with an inorganic mineral layer, and the inorganic mineral layer is coated with a mica tape layer formed by wrapping multiple layers of refractory mica tape layers. The mica tape layer is sequentially coated with a metal sheath layer and a flame-retardant outer sheath layer. When a fire occurs, the flame retardancy of the flame retardant outer sheath and the anti-oxidation, high wear resistance and high melting point characteristics of the metal sheath are used, and then the high flame retardant properties of the refractory mica tape, the inorganic mineral layer and the insulating inner sheath layer are used. It can realize the three-level fire protection of the cable, so as to protect the normal use of the cable.

Description

a fireproof cable

technical field

The invention relates to the technical field of cables, in particular to a fireproof cable.

Background technique

According to statistics, in most building fire accidents, the part caused by the aging of electrical fault circuits accounts for more than 50%. With the rapid development of urbanization, there are more and more high-rise buildings in developed cities, and more and more attention is paid to the fire-resistant cables used in buildings. Guarantee, in order to ensure the safety of the use of the cable, it can play a better role in fire prevention when a fire occurs, and ensure that the rescue equipment and floors can be powered on for a longer time. The design of fireproof cables is particularly important. From the perspective of some fireproof cables, the manufacturing process has potential hazards to the environment and human body. During the laying process, the cable has a small bendable radius and is difficult to lay. When it burns, a large amount of smoke and other harmful substances are generated, causing secondary damage to the human body. .

SUMMARY OF THE INVENTION

In order to make up for the deficiencies of the fireproof cable performance in the existing market, the present invention provides a fireproof cable, which can effectively improve the bending performance of the cable and reduce the secondary damage to the human body caused by harmful smoke generated when the cable is burned.

The technical solution provided by the present invention is: a fireproof cable, which includes at least four main electric cable cores and one ground cable core, and each of the main electric cable cores and one ground cable core is wrapped around the outside There is a wrapping tape layer, and an insulating inner sheath layer is extruded outside the wrapping tape layer. The insulating inner sheath layer is filled with an inorganic mineral layer, the inorganic mineral layer is covered with a mica tape layer wrapped by multiple layers of refractory mica tape layers, and the mica tape layer is sequentially covered with a metal outer sheath. A jacket layer and a flame retardant outer jacket layer, the metal jacket is a corrugated copper jacket or a corrugated aluminum alloy jacket, and the double-layer fireproof design can effectively ensure the normal energization of the cable in the event of a fire.

Preferably, each main wire cable core and a ground wire cable core are twisted together.

Preferably, each main wire cable core and one ground wire cable core are composed of seven solid copper conductors.

Preferably, a wrapping layer wrapped around each main electrical cable core and a ground cable core is a high temperature resistant and flame retardant non-woven fabric layer.

Preferably, the insulating inner sheath layer is a ceramicized low-smoke halogen-free polyolefin insulating layer, which can form a hard ceramic-like hard shell under high temperature conditions, has a very good heat insulation and fire insulation effect, and ensures that the cable core is normally used with electricity. .

Preferably, the flame-retardant outer sheath layer is a low-smoke halogen-free flame-retardant outer sheath layer, which will not emit toxic fumes when burning, so as to avoid secondary damage to the human body.

The beneficial effects of the invention are: from the outside and inside, there are structures such as a flame-retardant outer sheath layer, a corrugated metal sheath layer, a mica tape layer, an inorganic mineral layer and a ceramicized low-smoke halogen-free polyolefin insulating layer. The corrosion resistance, water resistance and wear resistance of the flame-retardant outer sheath layer and the embossed metal sheath layer ensure the long service life of the cable. In the event of fire, the corrugated metal sheath layer, mica tape layer, The inorganic mineral layer and the ceramic low-smoke halogen-free polyolefin insulation layer have high insulation and excellent fireproof performance, and provide multi-level fire protection for the cable core. The thread structure of the corrugated metal sheath effectively improves the cable folding The bending performance reduces the difficulty of cable laying.

In addition, compared with the fireproof cable in the prior art in which the conductor is wrapped with inorganic fiber fillers, the insulated fireproof cable provided by the present invention has a fireproof layer containing minerals, so there is no need to add inorganic fiber fillers. During the process, no fiber filaments will be scattered into the air, so that it will not affect the health of the operator.

Description of drawings

Figure 1 is a schematic diagram of the layered structure of the present invention.

Figure 2 is a schematic view of the cross-sectional structure of the present invention.

FIG. 3 is a schematic diagram of an enlarged structure of a main cable core.

In the figure, 1-flame retardant outer sheath, 2-metal sheath, 3-mica layer, 4-inorganic mineral layer, 5-main cable core, 6-ground cable core, 501-insulation inner Sheath layer, 502 - Tape layer, 503 - Solid copper conductor.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in the figure, a fireproof cable includes at least four main electric cable cores 5 and one ground cable core 6, and each of the main electric cable 5 cores and one ground cable core 6 is wound around the outside A wrapping tape layer 502 is wrapped, and the wrapping tape layer 502 is extruded and wrapped with an insulating inner sheath layer 501 . The inner sheath layer 501 is filled with an inorganic mineral layer 4, the inorganic mineral layer 4 is coated with a mica tape layer 3 wrapped by a multi-layer refractory mica tape layer, and the mica tape layer 3 is sequentially coated with a metal. Outer sheath layer 2 and a flame retardant outer sheath layer 1, the metal sheath 2 is a corrugated copper sheath or a corrugated aluminum alloy sheath, and the corrugated copper sheath or corrugated aluminum alloy sheath , to ensure that the cable has a larger bending radius, which is convenient for cable laying operations.

Preferably, the 5 cores of each main cable and one ground cable core 6 are closely surrounded in a ring shape. Preferably, each of the main wire cable cores 5 and one ground wire cable core 6 is composed of seven solid copper conductors.

Preferably, a wrapping layer 502 wrapped around each main electrical cable core 5 and one ground cable core 6 is a high temperature resistant and flame retardant non-woven fabric layer.

Preferably, the insulating inner sheath layer 501 is a ceramicized low-smoke halogen-free polyolefin insulating layer, which can form a hard ceramic-like hard shell under high temperature conditions, has a very good heat insulation and fire insulation effect, and ensures the main point cable Core 5 and ground cable core 6 are normally powered on and used.

Preferably, the flame-retardant outer sheath layer 1 is a low-smoke halogen-free flame-retardant outer sheath layer, which will not emit toxic fumes when burning, so as to avoid secondary damage to the human body.

The above description is only a preferred embodiment of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned examples. The above-mentioned examples and descriptions only illustrate the principle of the present invention. On the premise of departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. A fireproof cable comprising at least four main electric cable cores and a ground cable core, characterized in that: each of the main electric cable cores and one ground cable core is wrapped with a bag The tape layer is extruded and wrapped with an insulating inner sheath layer, the insulating inner sheath layer is filled with an inorganic mineral layer, and the inorganic mineral layer is covered with a multi-layer refractory mica tape. The mica tape layer is formed by wrapping layer by layer, the mica tape layer is sequentially coated with a metal sheath layer and a flame retardant outer sheath layer, and the metal sheath layer is a corrugated copper sheath or a corrugated aluminum alloy sheath. jacket. 2 . The fireproof cable according to claim 1 , wherein each main wire cable core and a ground wire cable core are closely surrounded to form a ring. 3 . 3 . The fireproof cable according to claim 1 , wherein each of the main wire cable cores and one ground wire cable core is composed of seven solid copper conductors. 4 . 4 . The fireproof cable according to claim 1 , wherein the wrapping layer wrapped around each main electric cable core and the ground cable core is a high temperature resistant flame retardant non-woven fabric layer. 5 . 5 . The fireproof cable according to claim 1 , wherein the insulating inner sheath layer is a ceramicized low-smoke halogen-free polyolefin insulating layer. 6 . 6 . The fireproof cable according to claim 1 , wherein the flame-retardant outer sheath layer is a low-smoke halogen-free flame-retardant outer sheath layer. 7 .

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